mirror of
https://github.com/mofeng-git/One-KVM.git
synced 2025-12-12 01:00:29 +08:00
258 lines
9.4 KiB
Python
258 lines
9.4 KiB
Python
# ========================================================================== #
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# #
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# KVMD - The main Pi-KVM daemon. #
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# #
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# Copyright (C) 2018 Maxim Devaev <mdevaev@gmail.com> #
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# #
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# This program is free software: you can redistribute it and/or modify #
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# it under the terms of the GNU General Public License as published by #
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# the Free Software Foundation, either version 3 of the License, or #
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# (at your option) any later version. #
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# #
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# This program is distributed in the hope that it will be useful, #
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# but WITHOUT ANY WARRANTY; without even the implied warranty of #
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the #
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# GNU General Public License for more details. #
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# #
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# You should have received a copy of the GNU General Public License #
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# along with this program. If not, see <https://www.gnu.org/licenses/>. #
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# #
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# ========================================================================== #
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import os
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import signal
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import asyncio
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import asyncio.subprocess
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from typing import List
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from typing import Dict
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from typing import AsyncGenerator
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from typing import Optional
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import aiohttp
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from ...logging import get_logger
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from ... import gpio
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# =====
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class Streamer: # pylint: disable=too-many-instance-attributes
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def __init__( # pylint: disable=too-many-arguments,too-many-locals
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self,
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cap_pin: int,
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conv_pin: int,
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sync_delay: float,
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init_delay: float,
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init_restart_after: float,
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shutdown_delay: float,
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state_poll: float,
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quality: int,
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desired_fps: int,
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host: str,
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port: int,
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unix_path: str,
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timeout: float,
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cmd: List[str],
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loop: asyncio.AbstractEventLoop,
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) -> None:
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self.__cap_pin = (gpio.set_output(cap_pin) if cap_pin > 0 else 0)
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self.__conv_pin = (gpio.set_output(conv_pin) if conv_pin > 0 else 0)
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self.__sync_delay = sync_delay
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self.__init_delay = init_delay
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self.__init_restart_after = init_restart_after
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self.shutdown_delay = shutdown_delay
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self.__state_poll = state_poll
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self.__params = {
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"quality": quality,
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"desired_fps": desired_fps,
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}
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assert port or unix_path
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self.__host = host
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self.__port = port
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self.__unix_path = unix_path
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self.__timeout = timeout
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self.__cmd = cmd
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self.__loop = loop
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self.__proc_task: Optional[asyncio.Task] = None
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self.__http_session: Optional[aiohttp.ClientSession] = None
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async def start(self, params: Dict, no_init_restart: bool=False) -> None:
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logger = get_logger()
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logger.info("Starting streamer ...")
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self.__params = {key: params[key] for key in self.__params} # Only known params
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assert 1 <= self.__params["quality"] <= 100
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assert 0 <= self.__params["desired_fps"] <= 30
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await self.__inner_start()
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if self.__init_restart_after > 0.0 and not no_init_restart:
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logger.info("Stopping streamer to restart ...")
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await self.__inner_stop()
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logger.info("Starting again ...")
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await self.__inner_start()
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async def stop(self) -> None:
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get_logger().info("Stopping streamer ...")
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await self.__inner_stop()
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def is_running(self) -> bool:
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return bool(self.__proc_task)
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def get_params(self) -> Dict:
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return dict(self.__params)
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async def get_state(self) -> Dict:
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self.__ensure_session()
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url = "http://%s:%d/state" % (self.__host, self.__port)
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state = None
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try:
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async with self.__http_session.get(url, timeout=self.__timeout) as response: # type: ignore
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response.raise_for_status()
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state = (await response.json())["result"]
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except (aiohttp.ClientConnectionError, aiohttp.ServerConnectionError):
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pass
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except Exception:
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get_logger().exception("Invalid streamer response from /state")
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return {
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"params": self.get_params(),
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"state": state,
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}
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async def poll_state(self) -> AsyncGenerator[Dict, None]:
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while True:
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yield (await self.get_state())
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await asyncio.sleep(self.__state_poll)
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def get_app(self) -> str:
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return os.path.basename(self.__cmd[0])
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async def get_version(self) -> str:
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proc = await asyncio.create_subprocess_exec(
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*[self.__cmd[0], "--version"],
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.DEVNULL,
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preexec_fn=(lambda: signal.signal(signal.SIGINT, signal.SIG_IGN)),
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)
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(stdout, _) = await proc.communicate()
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return stdout.decode(errors="ignore").strip()
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async def cleanup(self) -> None:
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if self.is_running():
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await self.stop()
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if self.__http_session:
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await self.__http_session.close()
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self.__http_session = None
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def __ensure_session(self) -> None:
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if not self.__http_session:
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if self.__unix_path:
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self.__http_session = aiohttp.ClientSession(connector=aiohttp.UnixConnector(path=self.__unix_path))
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else:
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self.__http_session = aiohttp.ClientSession()
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async def __inner_start(self) -> None:
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assert not self.__proc_task
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await self.__set_hw_enabled(True)
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self.__proc_task = self.__loop.create_task(self.__process())
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async def __inner_stop(self) -> None:
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assert self.__proc_task
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self.__proc_task.cancel()
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await asyncio.gather(self.__proc_task, return_exceptions=True)
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await self.__set_hw_enabled(False)
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self.__proc_task = None
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async def __set_hw_enabled(self, enabled: bool) -> None:
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# XXX: This sequence is very important to enable converter and cap board
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if self.__cap_pin > 0:
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gpio.write(self.__cap_pin, enabled)
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if self.__conv_pin > 0:
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if enabled:
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await asyncio.sleep(self.__sync_delay)
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gpio.write(self.__conv_pin, enabled)
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if enabled:
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await asyncio.sleep(self.__init_delay)
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async def __process(self) -> None: # pylint: disable=too-many-branches
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logger = get_logger(0)
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while True: # pylint: disable=too-many-nested-blocks
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proc: Optional[asyncio.subprocess.Process] = None # pylint: disable=no-member
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try:
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cmd = [
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part.format(
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host=self.__host,
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port=self.__port,
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unix=self.__unix_path,
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**self.__params,
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)
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for part in self.__cmd
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]
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proc = await asyncio.create_subprocess_exec(
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*cmd,
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stdout=asyncio.subprocess.PIPE,
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stderr=asyncio.subprocess.STDOUT,
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preexec_fn=(lambda: signal.signal(signal.SIGINT, signal.SIG_IGN)),
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)
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logger.info("Started streamer pid=%d: %s", proc.pid, cmd)
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empty = 0
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async for line_bytes in proc.stdout: # type: ignore
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line = line_bytes.decode(errors="ignore").strip()
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if line:
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logger.info("Streamer: %s", line)
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empty = 0
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else:
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empty += 1
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if empty == 100: # asyncio bug
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raise RuntimeError("Streamer/asyncio: too many empty lines")
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raise RuntimeError("Streamer unexpectedly died")
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except asyncio.CancelledError:
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break
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except Exception as err:
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if proc:
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logger.exception("Unexpected streamer error: pid=%d", proc.pid)
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else:
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logger.exception("Can't start streamer: %s", err)
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await asyncio.sleep(1)
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finally:
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if proc and proc.returncode is None:
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await self.__kill(proc)
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async def __kill(self, proc: asyncio.subprocess.Process) -> None: # pylint: disable=no-member
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try:
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proc.terminate()
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await asyncio.sleep(1)
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if proc.returncode is None:
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try:
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proc.kill()
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except Exception:
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if proc.returncode is not None:
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raise
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await proc.wait()
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get_logger().info("Streamer killed: pid=%d; retcode=%d", proc.pid, proc.returncode)
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except Exception:
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if proc.returncode is None:
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get_logger().exception("Can't kill streamer pid=%d", proc.pid)
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else:
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get_logger().info("Streamer killed: pid=%d; retcode=%d", proc.pid, proc.returncode)
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